Preparation of Cu@SiO₂composite nanoparticle and its tribological properties as water‐based lubricant additive

Abstract

In this paper, to solve the problem that di-n-hexadecyldithiophosphate (DDP)modified Cu nanoparticles initially used as oil-based lubricant additive cannot be directly used in water-based lubricants, we adopt a water-in-oil reverse micro-emulsion method to incorporate hydrophobic Cu nanoparticles into silica spheres for obtaining water-dispersible Cu@SiO 2 nanoparticles. The effects of reaction conditions on the morphology and microstructure of Cu@SiO 2 nanoparticles were investigated. Furthermore, the tribological properties of the as-prepared Cu@SiO 2 nanoparticles as a lubricant additive in distilled water were investigated with a UMT-2MT tribometer. Results indicate that the as-prepared Cu@SiO 2 nanoparticles exhibit good dispersion stability and antioxidant ability in distilled water. Besides, Cu@SiO 2 nanoparticles can significantly improve the tribological properties of distilled water, which is attributed to the formation of a protective and lubricious film consisting of Cu, FeS and SiO 2 on the rubbed steel surface. K E Y W O R D Scu@SiO 2 nanoparticles, reverse micro-emulsion system, tribological properties, water-based lubricant additive

Synthesis of Core–Shell Micro/Nanoparticles and Their Tribological Application: A Review

“…The results showed that the Cu-Ni@dodecanethiol particles almost had no sign of aggregation and exhibited good dispersibility in different non-polar solvents. Hydrophobic Cu nanoparticles were incorporated into silica spheres to solve the problem that the di-n-hexadecyldithiophosphate-modified Cu could not be used as a water-based lubricant, and the large amount of Si–OH groups on the SiO 2 surfaces could contribute to a significant improvement of dispersion of Cu@SiO 2 particles in water-based lubricants [ 84 ]. Furthermore, the wear rate was reduced up to 94.1% when used as a lubricant additive in distilled water.…”

pH‐dependent lubrication mechanism of graphene oxide aqueous lubricants on the strip surface during cold rolling

“…However, the emulsion may produce emulsion spots and stains, which may deteriorate the surface quality of strips. Thus, the water‐based lubricant has attracted more attention recently as an environmentally friendly fluid with unique features, such as low cost, high thermal conductivity, and better fluidity 7,8 . Nevertheless, the water‐based lubricant is limited significantly in the tribological filed on account of its internal performances, especially low viscosity and weak load‐carry capacity 8 .…”

“…Thus, the water‐based lubricant has attracted more attention recently as an environmentally friendly fluid with unique features, such as low cost, high thermal conductivity, and better fluidity 7,8 . Nevertheless, the water‐based lubricant is limited significantly in the tribological filed on account of its internal performances, especially low viscosity and weak load‐carry capacity 8 . To overcome the disadvantages of water‐based lubricant, carbon materials including graphene and graphene oxide (GO) have been extensively studied as additives owing to their good tribological ability, 9 unique mechanical property, 10 low shear strength, and so on 11 …”

“…7,8 Nevertheless, the water-based lubricant is limited significantly in the tribological filed on account of its internal performances, especially low viscosity and weak load-carry capacity. 8 To overcome the disadvantages of water-based lubricant, carbon materials including graphene and graphene oxide (GO) have been extensively studied as additives owing to their good tribological ability, 9 unique mechanical property, 10 low shear strength, and so on. 11 As an additive in the solvent, graphene has an excellent lubrication property in reducing the friction and wear between two contact surfaces for macrotribological applications.…”

SnS2 nanosheets as an excellent lubricant additive in polyalphaolefin oil

“…Nanolubricants, prepared by adding nanoparticles to oil‐based lubricants, are therefore proposed and their lubricating properties are topic of recent review paper 7‐9 . The various classes of nanoparticles were explored 10‐24 . Joly‐Pottuz and coworkers noticed that the oil dispersion with only 1 wt% of WS 2 nanoparticles presents the friction coefficient below 0.04 and very low wear at a contact pressure of 0.83 GPa 20 .…”